**Introduction** Greenland has emerged as a core US national security concern because it concentrates several strategic functions in one location: early warning and missile defense, control over the northern approaches to North America, exposure to intensifying great-power competition, and relevance to economic statecraft. **Why Greenland matters for US security** **1.** **Strategic location for defense and deterrence** Greenland’s geographic position makes it indispensable for US homeland defense. The Arctic provides the shortest route for intercontinental ballistic missiles and long-range bombers between Russia and North America, placing Greenland directly along critical early-warning and interception trajectories. US defense strategy identifies the Arctic as essential for aerospace warning, aerospace control, and maritime warning. Greenland forms part of the northern approaches to the United States and plays a role in securing transatlantic sea lines of communication between North America and Europe, which are central to the North Atlantic Treaty Organization reinforcement and crisis response. As Arctic routes become more accessible, the strategic importance of this geography is increasing rather than diminishing[1]. **2.** **Missile warning, missile defense, and space surveillance** Greenland’s role is reinforced by its function as a forward platform for missile warning and space surveillance. Pituffik Space Base hosts the Upgraded Early Warning Radar, which detects and tracks intercontinental and sea-launched ballistic missile threats and contributes to missile defense systems. The base also supports space surveillance and satellite command and control, providing a high-latitude vantage point that enables persistent monitoring of polar trajectories. These capabilities are central to US homeland defense, strategic deterrence, and space domain awareness, making Greenland operationally critical[2]. **3.** **Strategic competition and geoeconomic leverage** Greenland has become more prominent as strategic competition increasingly incorporates economic tools. Trade measures linked to Greenland have been used not only for commercial purposes, but also as instruments to influence control over territory and strategic assets[3]. This reflects a broader shift toward geoeconomic statecraft, in which tariffs, investment restrictions, and market access are used to pursue geopolitical objectives. Control over infrastructure, investment flows, and economic relationships surrounding Greenland has therefore become a matter of security concern, particularly as competition in the Arctic intensifies and external actors seek greater influence in the region. **Conclusion** Greenland has become a core US national security concern because it brings together defense, geography, and economic strategy in a way that reflects broader changes in global politics. It is a frontline position for Arctic and transatlantic security, a critical site for missile warning and space surveillance, and a focal point for emerging forms of geoeconomic competition. As the Arctic becomes more accessible and the use of economic tools in strategic rivalry expands, Greenland is likely to remain central to US security planning.
